A. 
No double T or double-T branch shall be used on soil or waste lines. No double hub shall be used on soil, waste or vent lines.
B. 
Drilling and tapping of house drains, soil, waste or vent pipes and the use of saddle hubs and bands are prohibited.
C. 
No fixture shall be double-trapped.
A. 
All underground traps and cleanouts of a building, except where cleanouts are flush with the floor, and all exterior underground traps, shall be made accessible by manholes at least 24 inches square inside or 30 inches inside diameter with proper covers of one-half-inch plate steel. If the trap is below the depth of 24 inches, the size of the manhole shall be increased to three feet by three feet.
B. 
Cellar or basement floor drains shall connect into a trap so constructed that it can readily be cleaned, and of a size to serve efficiently the purpose for which it was intended.
C. 
When subject to flow back or back pressure, such drains shall be equipped with an adequate backwater valve.
[Added 9-23-2002 by L.L. No. 4-2002]
No shower stalls or bathtubs shall be installed or maintained in any basement or cellar.